Hanging your bike from the wall should not cause a properly functioning fork to leak. I recently rebuilt my reba sl and it developed a similar leak. Source of the leak ended up being the small oring that goes on the brass colored aluminium plug at the center of the knob. SRAM doesnt sell this ring, but i was able to find the same size at a dive shop in tampa. The bike hangs from the rear tire and no leaks. Your fork should have a two year warranty, so you may want to have a shop give you an opinion before you go tearing into it.